Dr. Glen P. Perram
Professor of Physics at Air Force Institute of Technology
SPIE Involvement:
Author | Instructor
Area of Expertise:
Gas Laser , Kinetics , Hyperspectral Imagery , Spectroscopy , Remote Sensing
Websites:
Profile Summary

Dr. Glen Perram has served as a Professor of Physics at the Air Force Institute of Technology since 1989. He earned a B.S. in Applied and Engineering Physics from Cornell University in 1980 and his Ph.D. in Physics from AFIT in 1986. Dr. Perram received the 2013 Air Force Outstanding Civilian Senior Scientist Award for his work on Diode Pumped Alkali Lasers, is a fellow of the Directed Energy Professional Society, a registered professional engineer in the State of Ohio, and received the General Bernard A. Schriever Award for advancing aerospace power in 1995.
Publications (74)

PROCEEDINGS ARTICLE | September 8, 2017
Proc. SPIE. 10410, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2017
KEYWORDS: Holography, Digital holography, Wavefront sensors, Wave propagation, Turbulence, Range imaging, Wavefront distortions, Digital recording, Atmospheric propagation, Phase shifts

PROCEEDINGS ARTICLE | February 22, 2017
Proc. SPIE. 10097, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VI
KEYWORDS: Oxides, Carbon, Visible radiation, Carbon dioxide, Iron, Cameras, Spectroscopy, Laser energy, Calcium, Combustion, Fiber lasers, Laser irradiation, Emission spectroscopy, Laser damage threshold, Carbon monoxide, Cones, Oxidation

PROCEEDINGS ARTICLE | February 20, 2017
Proc. SPIE. 10090, Laser Resonators, Microresonators, and Beam Control XIX
KEYWORDS: Confocal microscopy, Mirrors, Resonators, High power lasers, Solid state lasers, Control systems, Semiconductor lasers, Laser resonators, Diodes, Laser optics, Rubidium, Performance modeling, Beam controllers, Diode pumped solid state lasers, Absorption

PROCEEDINGS ARTICLE | January 13, 2017
Proc. SPIE. 10254, XXI International Symposium on High Power Laser Systems and Applications 2016
KEYWORDS: Potassium, Dye lasers, Semiconductor lasers, Raman spectroscopy, Diodes, Infrared radiation, Optical pumping, Cesium, Pulsed laser operation, Rubidium

PROCEEDINGS ARTICLE | December 6, 2016
Proc. SPIE. 10014, Laser-Induced Damage in Optical Materials 2016
KEYWORDS: Visible radiation, Electronics, Titanium, Data modeling, Spectroscopy, Laser energy, Laser ablation, Aluminum, Pulsed laser operation, Plasma

SPIE Journal Paper | September 20, 2016
OE Vol. 56 Issue 01
KEYWORDS: Laser irradiation, Visible radiation, Continuous wave operation, Temperature metrology, Spectroscopy, Molecules, Emission spectroscopy, Carbon, Fiber lasers, Molecular lasers

Showing 5 of 74 publications
Course Instructor
SC1036: Diode Pumped Alkali Lasers
The quest for a high power, electrically driven laser with excellent thermal management, lightweight packaging, and high brightness for tactical military applications may be realized with the advent of the Diode Pumped Alkali Laser (DPAL). The concept of using a gas phase medium for the phasing of large diode arrays via a highly efficient, cyclical photon engine combines the best features of electrically driven lasers with the inherent thermal management advantages of a gas lasers. Indeed, the DPAL concept has sparked great interest within the Directed Energy community resulting in a number of recent low power, highly efficient laser demonstrations. A modest national effort is underway to exploit this technology for military applications. Early laser demonstrations of the Diode Pumped Alkali Laser achieved output powers of 1-3 W in both rubidium and cesium with slope efficiencies as high as 82%. More recently, cw output powers as high as 145 W with in-band slope efficiencies of 28% have been reported. The system is a three level laser pumped by diode bars on the D2 transition, exciting the first 2P3/2 state of the alkali atom. Collisional relaxation to the 2P1/2 state is accomplished with a spin orbit relaxing gas such as ethane or methane, while pressure broadening of the absorption line has routinely been accomplished with He. The excited alkali atom then lases on the D1 line back to the ground state. Terminating the laser level at the ground state requires the gain volume to be fully bleached before achieving an inversion between the 2P1/2 and 2S1/2 states, resulting in pump threshold values of ~1 kW/cm2. This course will develop the background spectroscopy and kinetics of the DPAL system, summarize recent laser demonstrations, discuss narrow banding of diode pump sources, develop the key performance and scaling equations, and outline several issues in the development of these devices.
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